W32.Downadup.C is a threat that is downloaded on to the compromised computer by the W32.Downadup family of worms.

Note: Some vendors have detected W32.Downadup samples as Conficker.C or Downadup.B++. Symantec's W32.Downadup.C is a different detection and is not to be confused with these Conficker.C and Downadup.B++ detections.